Glucocorticoids are the first-line treatment option for pemphigus. Moreover, abnormal uterine bleeding (AUB) is a rarely reported side effect of glucocorticoid treatment that usually manifests as abnormal and excessive endometrial bleeding; in fact, AUB can be induced by the systemic or topical application of glucocorticoids. In the present report, we describe the cases of 3 patients with pemphigus who developed AUB following glucocorticoid administration. It is important to note that the administration mode of glucocorticoids, and the onset time and duration of AUB differed among these patients. Thus, we propose the following treatment algorithm for AUB following glucocorticoid administration: 1. perform a gynecological and physical examination to exclude organic diseases. 2. continue glucocorticoid treatment. 3. if AUB persists, change the mode of administration of glucocorticoids. 4. if AUB still persists, despite these measures, completely withdraw treatment with glucocorticoids and use non-glucocorticoid treatments.